1819813564 has 12 divisors (see below), whose sum is σ = 3185355600. Its totient is φ = 909711968.

The previous prime is 1819813547. The next prime is 1819813573. The reversal of 1819813564 is 4653189181.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26569 + ... + 65920.

It is an arithmetic number, because the mean of its divisors is an integer number (265446300).

Almost surely, 2^1819813564 is an apocalyptic number.

It is an amenable number.

1819813564 is a deficient number, since it is larger than the sum of its proper divisors (1365542036).

1819813564 is a wasteful number, since it uses less digits than its factorization.

1819813564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 97412 (or 97410 counting only the distinct ones).

The product of its digits is 207360, while the sum is 46.

The square root of 1819813564 is about 42659.2728958195. The cubic root of 1819813564 is about 1220.8874587358.

The spelling of 1819813564 in words is "one billion, eight hundred nineteen million, eight hundred thirteen thousand, five hundred sixty-four".